化简再求值:6X^2-(2X-1)(3X-2)+(X+2)(X-2),其中X=2

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化简再求值:6X^2-(2X-1)(3X-2)+(X+2)(X-2),其中X=2

化简再求值:6X^2-(2X-1)(3X-2)+(X+2)(X-2),其中X=2
化简再求值:6X^2-(2X-1)(3X-2)+(X+2)(X-2),其中X=2

化简再求值:6X^2-(2X-1)(3X-2)+(X+2)(X-2),其中X=2
6X^2-(2X-1)(3X-2)+(X+2)(X-2)
=6x^2-6x^2+7x-2+x^2-4
=x^2+7x-6
=4+14-6
=12

6X^2-(2X-1)(3X-2)+(X+2)(X-2)
=6X^2-(6X^2-4X-3X+2)+(X^2-4)
=6X^2-6X^2+4X+3X-2+X^2-4
=X^2+7X-6
=2^2+7*2-6
=4+14-6
=12